Many elements of Hellgate will remind you of Diablo, like the instanced content and randomized maps. But Flagship is taking it to a new level, with “rare” versions of areas with bonus encounters and enemies, and new more randomly found quests that might not be there the first time you come through an area (but will show up maybe on the fourth or fifth time). Guild-sized battles will be in there, as well as smaller groups and even the ability to go solo.